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2 Mechanics and Mechanical Engineering

2 2017

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Multi objective optimization by application of Taguchi based Grey Relational Analysis for GMA welding of IS2062 structural steel

Rizvi S. A., Tewari S. P.

Mechanics and Mechanical Engineering

2017

Vol. 21, nr 3

717--729

Basic object of this research article was to investigate the parametric optimization of welding parameters such as arc voltage, wire feed speed and shielding gas flow rate for IS 2062 structural steel by integrating Taguchi method and Grey relational analysis. Experiments were conducted as per L16 (4xx3) orthogonal array. Design and Mechanical properties such tensile strength, Microhardness, toughness, and Microstructure of IS 2062 structural steel optimized by Grey-based Taguchi analysis were investigated, as they were selected as quality targets. Based on result of the grey relational analysis, a set of optimum welding parameters was obtained. The observed data from result have been interpreted, discussed and analyzed by integration of Grey-Taguchi methodology to optimize tensile strength, microhardness and percentage elongation.

Effect of the shielding gas flow rate on mechanical properties and microstructure of structural steel (IS2062) welds

Rizvi S. A., Tewari S. P.

Mechanics and Mechanical Engineering

2017

Vol. 21, nr 4

971--984

Structural steel is frequently used for industrial purpose as it is more economical as compared to other steels .In the present research article an attempt has been made to find, how the mechanical properties and microstructure properties of the IS2062 structural steel are affected by the different welding parameters such as shielding gas flow rate, voltage, wire feed speed and welding current. In this research work 75%Ar+25%CO2, is used as shielding gas because it is a best shielding gas mixture for getting a good quality mechanical properties and micro structural properties of welded joint. For study of fracture mode of tensile fracture, SEM test carried out which help to understand the factor influence the microstructure and it is found that the Fractures of tensile samples are brittle in nature which shows the low ductility and brittle fracture. Micro hardness values change throughout weld metal varying by shielding gas flow rate.